Bronzing-machine.



GEORGE J. HAFNER, or noonnsmnmnnw YORK', ss'IeNoia 'ro lmarmein PRINTING MACHINERY COMPANY, 0F 0F MASSACHUSETTS.

Jani- AICA PLA1N,MAssAcHUsETrs, A ooRBoRArIon,

T0 all whom may concern Be it known that I, GEORGE This invention is a novel improvementin so-called bronzing` machines by. ,whichv fine metallic powders are applied-'to'paper or fabric; and the present inventionis an` improvement upon that type of .machine wherein the bronzing is eiected by means of a. cylinder and co-'acting rolls and pads which thoroughly rub the bronze powders into the sizing on the paper or fabric-,such

operations being performed in a chamber through which the paper is passed and into which' the-bronzing powders are introduced and any surplus bronze powder' introduced into the ychamber is brushed from the paper' orfabric and withdrawn from the chamber by meansoi:l a suctionfan or pump; and the Y powder laden' air is usually dlscha ged from said chamber vinto a separator pre erably of the so-ca'lle'd cyclone type, by which the powder is separated from the air, while the purified air escapes into the atmosphere.-

`The present invention in'particular is an improvement upon the type of machine shown in Patent No. 797,080 to -M. Smith, datedAugust 15, 1905, wherein the parts vare so arranged that the separated bronzing powders are returned to the bronzing chamber; the bronie laden air passing from thebronzing chamber to the fan chamber and thence tothe separator, and suiicient suction being maintained vin the bronzingr chamber'j to induce a flow of air thereintothrough any `openings or crevices; thus preventing'the bronzing p'owders escaping from the chamber into v'the operating room; or outside of the machine; the p resence of such'powders in the operating room being objectionable and detrimental to health. I have discovered in the operation of machines'of. this type that some of the surplus bronzing powder withdrawn from the bronzing chamber has been'moistened by the size on the, paperA or fabric being treated, and suche-r damp or moistened powder is'liable tofag-4 Vg'lomerate and it immediately returned to JIIIAr'NEn, .of Rochester, in the county. of Monroe and r operation ofthe; machine and intheguality spciacato of Letters raient. .Patented-App jpg, 1915;] Appncation med Jane 17,191,2. se-ri'ai Nofvcaoes. A 4

such nioistened or sized particles of powder from the V dry powder, and to' collect lsuch 'inolstened particles'in a'suitable receptacle so that they may be -thoroughly driedA before' being .returned vto the bronzing chamber.:

.of work produced thereby.

.I will now explain the invention more inf detail with reference to the accompanying drawings 1n `.which I have conventionally illustrated abronzing machine to which my inventionfis applied.

In the claimsannexed to "the description I have -summarizedthe features of the in. vention-for which protection .is desired.

In. said drawings-Figurel is a diagram`- matic side eleyation partly' in section of a -complete bronzing vapparatus embodying my` invention. Fig -2 lis a transverse sectional view ofsuchmachine.

As stated the bronzing machine itself may be 'of any desired'type.' As indicatedin lthe drawings, lthe said machine preferably' com.-4 i

prises .a casing 1 within which is a bronzing cylinder 2 which is rotatably mounted within a substantially'closed bronzing `chamber' Y 19: infsaid' casing. The-cylinder 2 is pro- 'videdwith grippers 22er othersuitablede--.

vic6S,f .adapted 'to take sheets vtrom "fa feed table lb and carry thempast the bronzing' devices and eventually surrender themtoa delivery cylinder;

-' y'The 'bronzing devices co-acting with the.

cylinder comprise a ountain orv hopper 2f Vfrom which the vbronzing powder is fed by a suitable regulating device, onto .the paper or fabric on cylinder 2, and after passing the hopper the powder is. rubbed into the sized portions of the sheet by means of hurling rolls 2" and vibrating pads 2; then the sheet is carried past -bufiing rolls 2@ which cleany and finish the sheet; and the bronzed sheet is taken from cylinder 2 by cylinder Sand delivered thereby to a fly 3a which lays the sheetsfupona suitable receiver.

rIhe chamber' 1a communicates at bottomA` with an air trunk 4; and a screen l may be placed in' the bottom of the chamber la to with .the surplus bronze powder deposited tl'ierein.4

preventpaper or rough material mixing' clone separator in which the bronze -is separated from the air in the well known manner,'the purified airescaping through an opening 5*-1 in the top of the separator into a hood'5b` from which the air maybe conductedthrough a pipe 5 out ofdoors, orto any other'suitable point of discharge.

. 5 drops into areceptacle which may bein the .form ofa metal cylinder 6 having a conical top 6a which is connected by a neck 6c to the bottom of the separator 5 and by which the separator may be supported; and

the separator may be steadied by means 'of brace rods 6d. This receptacle 6 may. be supported on a shelf 1 attached to the casing 1, or to any other suitable support. The receptacle 6' has a door 6 which may be closed v1n any suitable manner, preferably ain tightly,.and through which-.a vessel-7 may be `introduced into the chamber to receive y the heavybronze powder dropped thereinto from the separator. To insure that .the air pressure in the receptacle 6 shalllbe less Ithan'the pressure in the lower part Qf they separator 5 the 'upper part of the receptacle fountain or hopper-2*; this vpipe 8 may be conveniently connected to the conical top. 6** `YVV` cfreceptacle 6 and to the topof the hopper 2fas shown 'in the drawings.`

drawn from chamber 6 through pipe8 into the lhopper 2f and thence through.. the air 4tubes 2 into the bronzing'chamber laas Ail;V willv be indicated inthe drawings; this-icurrent of air being produced by thesuction in chain-l l l vber'la caused by fana. y 45 tion 6.,be'tween the separator and the Are'- 'ceptacle ordepositing chamber .6 `so that be'- fore the chamber isopened for the 'removal of the vessel 7 said valve may be closedto pre'vent the escape of dust laden air -into the fr'oom, without necessitating the stoppage of A'. valve 6. may be lplaced in'tlieconnec-y thebronrqng o erations.

' yOperation: n the operation of the `machine the fan'maintainsa partial vacuum in the bronzingchamber' 1a by withdrawing air therefrom. and any .loose `or surplus powder admitted into the chamber, and brushedoii'- of the paper or fabricbein'g bronzed will be withdrawn from'the chamber 1a and Ydis charged through pipe 4* into the separator the clear air escapes to the outlet pipe 5c. The separated bronze powder will descend by gravity into the receptacle or depositing l' The powder precipitated in the separator.

' ber, and bronzing devlces chamber 6 and the wet or moist particles of bronze powder will drop yat once into the vesselv, but the very light dry particles of powder floating in the upper part of the chamber 6 will be drawn into pipe 8 and returned to the fountain 2f'wherein they are 'deposited by gravity.

The pipe 8 also serves to keep the air pressurein the depositing chamber Gbelow the pressure inthe cyclone separator, and this facilitates separation of the powders from the air .in the separator'. By this invention lonly perfectly dry bronze powder will be used in the machine, and therefore a much better quality of. work is produced than in machineswherein the damp or moist powders are immediately returned to the bronzing chamber; because such damp powders have a tendency t0 adhere to the paper or fabric/and produce mottled or speckled powders also tend to agwork; the* wet glomerate with particles of the dry powder and 'would eventually make the powder too thick and heavy for fine work. The moist or wete-powder caught in the depositing chamber 6 can beremoved when desired, and can be dried out before being returned to -the'fountain By reason of the suctionl in the bronzing chamber and inthe upper part -of the depositingchamber 6 the bronze powder is .prevented from escaping into the .'.IOOIIL `Y What I claim is:

6 is lconnected by means of apipe 8 with .the

f 1. In combination, fa bronzing machine having a bronzel hopper, a bronzing chamber and bronzlng devices therein; means for withdrawing bronze. laden air from saidbronze: separated fromthe air; with a depositing chamberfinto which the powders precipitated in the separator are discharged, anda returnpipe connecting said chamber .with t'he bronzing'hopper, substantially as described.

f k2. In'. combination, lhaving va bronze hopper, a bronzing chama bronzing -machine in said chamber; means adapted to withdraw bronze laden air from sald chamber; and a cyclone'separator into which the bronze laden air 1s discharged Y and separated from the bronze; with a depositing `tated bronze .is discharged from .said sepachamber into which theprecipi rater; and a suction pipe leading from said depositing chamber to the bronzing hopper; whereby'while wet particles of powder are trapped in said depositing chamber the light dry particles may be returned to the bronzing hopper. l

3. In' a-bronzinglmachine, the combination of a chamber' communicating with the atmos'phere; means for applying bronze to sheets of paper passing through said chamber; a fountain .for supplying bronze to said lso bex' into `which bronze' precipitated. nfthl" separator is dicharged, and a* sucbonpipe ommunicating with th@ upper part 0f' sm'dl parti-Cles of oronzepowder may be retullned therefrom to' the Voriing chamber. n En testimony 'that ]Ljlam the foragoing 'as my oWn-aX-'my 'signature in presence of 

